Indicator



N. F. KEMPEL INDICATOR April 1A, 1924.

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Patented apr. 1,1924.

letales NORBERT F. KEMPEL, OE CHICAGO, ILLINOIS.

INDICATOR.

Application filedv Apr 3,1923. Serial No. 629,734.

T0 all @co/wm t may concern:

Be it known that l, NORBERT F. KEMPEL, a citizen of the United States, residing at Chicago, in the county of Cook and State of illinois, have invented new and useful lmprovements in Indicators, of whichthe fol-` lowing is a specilication.

My invention relates to improvements in indicators and has special reference to devices used in connection with the watercooling system of a motor vehicle.

The radiator., as is the case with all other parts of the water-cooling system of a motor vehicle, is subjected to considerable expansion and contraction movement due to the varying pressure of steam within the radiator. rl`hese movements and stresses tend to 'disrupt the joints between the radiator and its tubes and ofttimes causes the bursting of a weak spot in the radiator with resultant leakage, making it -necessary to provide mea-ns to indicate and automatically relieve the dangerous steam pressure content of the cooling fluid.

The principal object of the invention is to provide a device that will respond to the steam pressure within a radiator when said pressure closely approaches the safety factor used in the constructionof a radiator.

A. still further object of the invention is to provide means whereby the pressure of the steam within a radiator or cooling system ma;T be relieved at a predetermined period.

.A still further object of the invention is the simplicity in the construction and the decreased cost of manufacture which, together with the importance of ya device of this character, tends to assure its commercial success.

With the above and other objects in view, as will be hereinafter apparent, the invention consists in general of certain novel important features, hereinafter fully described,

` and illustrated inthe accompanying drawings, and the appended claims.

ln the accompanying drawings, like characters of reference indicate similar parts in the several views of which:

Figure 1 is an elevation of the device in its normal position, illustrating the means for attaching the same to a radiator cap;

Fig. 2 is an elevation of the device showing it in operative position;

Fig. 3 is a central vertical longitudinal section through the device in its normal position, and i Fig, a is a similar view showing the device in operative position.

Generally speaking my device consists of a. body portion 5, which is reduced in diameter at its lower end to form a screwthreaded shank 6 for insertion in an aperture in a radiator cap 7, whereupon a nut 8 is applied which securely supports the device in position. hesaid body portion 5 also has a longitudinal bore 10 which terminates just short of the top of the former and is here provided with an axial aperture 11, the purpose of which will be hereinafter pointed out, and further, the said body portion 5 is reduced in diameter at its uppermost end, as indicated at 12, the shoulder 18 formed thereby being given a slight bevel, as clearly shown in Fig. 2.

Slidably mounted in the said longitudinal bore 10 is a reciprocatory plunger 1a which is carried by a vertical rod 15, the latter also supporting abullet-shaped hood 16 at its upper end. The vertical rod 15 passes through the aperture 11, hereinbefore mentioned.

0n reference to Fig. 3, it will be noted that said hood 16 is cored out, as indicated at 17, and also that the peripheral rim formed at the base of said hood 16 is given an upward bevel as indicated at 18.

lt will thus be seen that when the device is in its normal position the reduced portion 12 extends upl into the'cored portion 17 of the hood 16, the peripheral rim of the latter resting on the beveled shoulder 13 of the body portion 10.

'lhe operation of the device will be readily understood on reference to Figs. and a. The steam in the radiator attaining more than the proper pressure forces the plunger 14 upwardly causing the hood 16 to rise and indicate 'to 'the operator of a motor vehicle that the steam in the radiator has reached' the danger point. The hood 16 may be colored or givenany distinctive marking to better attract the attention` of the operator.

In order to provide relief for abnormal` steam pressure in the radiator l aperture the body portion to form a port 19. Thus when the plunger 111 is forced to travel the entire length of the bore 10 and reaches its upward limitation by contacting with the to of the longitudinal bore 10, said port 19 establishesl open communication between the radiator and the atmosphere permitting the escape of steam until its pressure is reduced and the plunger 14 drops' downwardly closing the port 19 -and cutting of the escape of steam. The hood 16A acts as a seal to prevent entrance of dirt into the aperture 19 When conditions are normal, and When there is an excess of steam within the radiator said cap 16 is elevated to act asa signal,

in accordance Withv the patentt statutes, I haveillustrated my invention in concrete form and as constructed Vin a specified manner, but itwill lbemlistinctly understood that l do Anot'p'roposeto limit mysel'f'tolthe prevoise structural detail set forth, since various modifications will, immediately i suggest themselvesto those skilled in the,'a rt Without departingfrom the spirity of invention, theyscopeofV which is 'set forth in the following` claims. e

Having thus"V described 4my invention, I

eiaim'lasnew and desire to secure by Letof an indicator,comprising ,al bodyportion having .a ,longitudinal bore terminating just short of the top of saidl bodyhportion., the latter 4being ydiametrically reducedv at its uppermostA portion and having ,a A port lcomL municating with saidubolre, a closure member receivable land guided upon 4said reduced uppermost portion of said body and functioning,l` to normally close said port, a plunger capable #of reoiprocatory motion Within said longitudinal bore actuated by thsluid pressure Within the radiator, and an operative` connection betweeny said closure and the upper e'i'id of said plunger.

The combination with a radiator cap; an. indimrtorl comprising a body portion having,r a longitudinal bore and an atmosphere communicating opening leading therefrom, a closure member for said openin; Iguided upon the` exterior of said body portion, and pressureV responsive Y means Within said bore having an ,operative connectio'n `Witlisaid closure member. V

rlie combination with a radiator cap; oi? an indicator comprising a body portion having a recess therein in communication with the interior, of 4the lradiator and an atmosphere g-onimunicating port leading from saidwrecess, a Amovable visual signal for no'iially closing said port When in non-signalling position, and meaiis gioverned by the pressurejvithiii the `'rad-dater oiyactuating said visual signal from port closing` to signalling position.

5, in indicator comprising a substantially hollow body portion openl at one end and having an atmosphere communicating port leadingy l from said openend, a signal membercaryriechby saidv bodyI ,portion for normally losingY said port ,Xi/'lien innen-signalling position,I :andpressure responsive means Within said body por :on having an operative connection with said signa-l member for mov- 'ing` tlie same from port closing to signalling position. l p

in testimony whereof I aiiix my signature.

NGE-BERT F'. KEMPEL.

Ithrough4` one -Wall thereof remote` 

